LONDON, ENGLAND - MAY 26: Opposition Labour Party leader Jeremy Corbyn makes a speech on defence on May 26, 2017 in London, England. Mr Corbyn stated that UK foreign policy would change under a Labour government to one that 'reduces rather than increases the threat' to the country, as election campaigning resumed after the attack in Manchester earlier this week. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - MAY 26: Opposition Labour Party leader Jeremy Corbyn (C-R); his wife, Laura Alvarez (L); Shadow Attorney General for England and Wales, Shami Chakrabarti (C-L) and Shadow Home Secretary, Diane Abbott (R) stand for a minute silence in memory of the victims of the Manchester terror attack before making a speech on defence on May 26, 2017 in London, England. Mr Corbyn stated that UK foreign policy would change under a Labour government to one that 'reduces rather than increases the threat' to the country, as election campaigning resumed after the attack in Manchester earlier this week. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - MAY 26: Opposition Labour Party leader Jeremy Corbyn makes a speech on defence on May 26, 2017 in London, England. Mr Corbyn stated that UK foreign policy would change under a Labour government to one that 'reduces rather than increases the threat' to the country, as election campaigning resumed after the attack in Manchester earlier this week. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - MAY 26: Opposition Labour Party leader Jeremy Corbyn makes a speech on defence on May 26, 2017 in London, England. Mr Corbyn stated that UK foreign policy would change under a Labour government to one that 'reduces rather than increases the threat' to the country, as election campaigning resumed after the attack in Manchester earlier this week. (Photo by Carl Court/Getty Images)